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Chapter 14: Q.21558-14-49P (page 563)

Question: Rank the highlighted carbon atoms in each compound in order of increasing chemical shift.

a.

b.

Short Answer

Expert verified

Answer

a. Ca< Cb < Cc

b. Cc < Cb< Ca

Step by step solution

01

Chemical shift

13C spectroscopy gives a downfield (higher value) chemical shift and an upfield chemical shiftaccording to the non-equivalent chemical environment present around the atom which is under observation.

02

Explanation

a.

Labeled carbon

Ccis adjacent to the carbonyl oxygen which is an electronegative atom. Therefore, Cc has higher value of chemical shift. Cb is also close to carbonyl oxygen followed by Ca.

Therefore, the order of chemical shift value is shown as:

a. Ca < Cb < Cc

b.

Labeled carbon

Cahas higher value of chemical shift due to presence of sp2 hybridized atoms. Ccis adjacent to Br which is an electronegative atom. Therefore, CC has higher value of chemical shift. Cb is also close to the double bond.

Therefore, the order of chemical shift value is shown as:

b. Cc < Cb < Ca

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Most popular questions from this chapter

Question: Using a 300 MHz NMR instrument:

a. How many Hz downfield from TMS is a signal at 2.5 ppm?

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c. If two signals are separated by 2 ppm, how many Hz does this correspond to?

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